Fair value measurement - Changes in level 3 assets and liabilities measured at fair value on a recurring basis (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	$ 104,465	$ 116,209	$ 111,054	$ 121,499
Gains (Losses) included in earnings	(3,839)	(4,900)	(9,374)	(10,793)
Gains (losses) included in OCI	(1)	2	(3)	2
Additions	281	337	779	998
Settlements		(25)	(50)	(83)
Transfers in (out) of Level 3			(1,500)
Ending Balance	100,906	111,623	100,906	111,623
Changes in unrealized gains (losses) relating to assets still held at reporting date	(1,505)	(2,571)	(2,459)	(3,261)
Debt securities available-for-sale \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	432	581	484	606
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	(1)	2	(3)	2
Additions	0	0	0	0
Settlements		(25)	(50)	(50)
Transfers in (out) of Level 3			0
Ending Balance	431	558	431	558
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	0	0
Debt securities available-for-sale \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	750	2,000	2,250	2,500
Gains (Losses) included in earnings	0	0	0	(500)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Settlements		0	0	0
Transfers in (out) of Level 3			(1,500)
Ending Balance	750	2,000	750	2,000
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	0	0
Trading account debt securities \| CMO
Assets, Fair Value Disclosure [Abstract]
Beginning Balance			0	5
Gains (Losses) included in earnings				0
Gains (losses) included in OCI				0
Additions				0
Settlements				(5)
Ending Balance		0		0
Changes in unrealized gains (losses) relating to assets still held at reporting date				0
Trading account debt securities \| Mortgage Backed Securities
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	84	84	84	112
Gains (Losses) included in earnings	0	0	0	0
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Settlements		0	0	(28)
Transfers in (out) of Level 3			0
Ending Balance	84	84	84	84
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	0	0	0
Trading account debt securities \| Other
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	122	158	133	167
Gains (Losses) included in earnings	(4)	(4)	(15)	(13)
Gains (losses) included in OCI	0	0	0	0
Additions	0	0	0	0
Settlements		0	0	0
Transfers in (out) of Level 3			0
Ending Balance	118	154	118	154
Changes in unrealized gains (losses) relating to assets still held at reporting date	0	6	23	18
Mortgage Servicing Rights
Assets, Fair Value Disclosure [Abstract]
Beginning Balance	103,077	113,386	108,103	118,109
Gains (Losses) included in earnings	(3,835)	(4,896)	(9,359)	(10,280)
Gains (losses) included in OCI	0	0	0	0
Additions	281	337	779	998
Settlements		0	0	0
Transfers in (out) of Level 3			0
Ending Balance	99,523	108,827	99,523	108,827
Changes in unrealized gains (losses) relating to assets still held at reporting date	$ (1,505)	$ (2,577)	$ (2,482)	$ (3,279)

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Amount of unrealized gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3) and still held.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy.

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